Hairpin vortex organization in wall turbulencea

Research output: Contribution to journalArticle

683 Citations (Scopus)

Abstract

Coherent structures in wall turbulence transport momentum and provide a means of producing turbulent kinetic energy. Above the viscous wall layer, the hairpin vortex paradigm of Theodorsen coupled with the quasistreamwise vortex paradigm have gained considerable support from multidimensional visualization using particle image velocimetry and direct numerical simulation experiments. Hairpins can autogenerate to form packets that populate a significant fraction of the boundary layer, even at very high Reynolds numbers. The dynamics of packet formation and the ramifications of organization of coherent structures (hairpins or packets) into larger-scale structures are discussed. Evidence for a large-scale mechanism in the outer layer suggests that further organization of packets may occur on scales equal to and larger than the boundary layer thickness.

Original languageEnglish (US)
Article number041301
JournalPhysics of Fluids
Volume19
Issue number4
DOIs
StatePublished - Apr 2007

Fingerprint

horseshoe vortices
Boundary layers
Vortex flow
Direct numerical simulation
Kinetic energy
Velocity measurement
Momentum
Reynolds number
Turbulence
Visualization
boundary layer thickness
high Reynolds number
particle image velocimetry
direct numerical simulation
boundary layers
kinetic energy
Experiments
turbulence
vortices
momentum

ASJC Scopus subject areas

  • Mechanics of Materials
  • Computational Mechanics
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes
  • Condensed Matter Physics

Cite this

Hairpin vortex organization in wall turbulencea. / Adrian, Ronald.

In: Physics of Fluids, Vol. 19, No. 4, 041301, 04.2007.

Research output: Contribution to journalArticle

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